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Once the OC sells the debt, they are required only to update the account to show a $0 debt balance owed to them.
Yes, any derogs they reported would remain. You can no longer request a PFD with them, as you have no more debt for them to accept in exchange for CR deletion of their reporting.
The acquiring debt collector can additionally report their collection. It is common for multiple derogs related to the same debt to be reported.
However, if debt collector 1 then sells the debt to debt collector 2, the CRA reporting manual instructs debt collector 1 to delete their reporting.
There is no requirement under the FCRA that they do so, and thus a dispute would not be the proper path.
Send a request to the CRA for deletion of debt collector 1 based on thier administrative reporting guidelines.
You can offer the current owner a PFD, and send GW requests to the OC pertaining to any reporting they have made.